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Basis of Presentation (Details Textuals) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Basis Of Presentation [Line Items]    
Cash and cash due from banks $ 2,253 $ 2,145
Other liabilities 16,039 15,593
Scenario Adjustment Balance [Member]
   
Basis Of Presentation [Line Items]    
Cash and cash due from banks   353
Other liabilities   $ 353